/Engine/Source/Editor/UMGEditor/Public/Designer/SDesignerView.h
Takes geometry and adds the inverse of the window transform to get the geometry in the space of the window.
virtual [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) MakeGeometryWindowLocal ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & WidgetGeometry ) const